GMM fitting results for a simulated distribution of 450 stars with three RV components with the mean and dispersion adopted for bulge and disc, and that derived for FSR 1776. The top panel shows the input Gaussians that represent the bulge, disc, and cluster used to generate the histogram (in blue). The middle panel shows the best result with (RV,σ) =(−34,  54) km s⁻¹. The bottom panel shows the result forcing the GMM to find three components: (RV, σ, fraction) =(−21,  29,  42%),  (33,  38,  29%),  (−119,  36,  29%) km s⁻¹.